In an extraordinary couple of years of drama in Canberra, the usually sedate (read: dull) capital, three leaders—including two sitting prime ministers—have been toppled and replaced by their own parties, partly due to disagreements over climate change.

Saturday's national election, if we're to believe the opposition's rhetoric, will be a referendum on the future of the carbon tax that was introduced by the Labor Party that has been in power for the last six years. Tony Abbott, the head of the conservative opposition is leading opinion polls. In the likely scenario he wins, he has promised to repeal the carbon pricing legislation.